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The American Yawp
American History Online Textbook - Students of History
Building the American Republic -- a free digital textbook for US history
U.S. History - Open Textbook Library - Center for Open Education
U.S. History - OpenStax
American History: Connecting with the Past (15th Edition)
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The AmericAn YAwp
Free Online Textbooks - US History
The Beginner's American History by D. H. Montgomery
15+ U.S. History Books for Free! [PDF] - InfoBooks.org